/* ==========================================================================
   RESTAURANT / HOTEL BILL GENERATOR - MOBILE-FIRST STYLESHEET
   ========================================================================== */

:root {
  --primary-color: #1e293b;
  --primary-hover: #0f172a;
  --accent-color: #2563eb;
  --accent-hover: #1d4ed8;
  --success-color: #16a34a;
  --danger-color: #dc2626;
  --danger-hover: #b91c1c;
  --bg-color: #f1f5f9;
  --card-bg: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border-color: #cbd5e1;
  --receipt-bg: #525659;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 10px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
  --touch-target: 44px;
  --font-family-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  --font-family-mono: 'Courier New', Courier, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-ui);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
  padding-bottom: env(safe-area-inset-bottom, 20px);
}

/* Ensure no horizontal scroll on tiny screens */
@media (max-width: 360px) {
  html {
    font-size: 14px;
  }
  .page-wrapper {
    padding: 8px !important;
  }
  .form-card {
    padding: 12px 10px !important;
  }
  .preview-container-card {
    padding: 14px 8px !important;
  }
  .receipt {
    padding: 14px 8px !important;
    font-size: 12px !important;
  }
  .header-container {
    padding: 10px 8px !important;
  }
  .brand-title {
    font-size: 1rem !important;
  }
}

/* ==========================================================================
   NAVIGATION & HEADER
   ========================================================================== */

.app-header {
  background-color: #ffffff;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
  padding-top: env(safe-area-inset-top, 0);
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.brand-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

.brand-badge {
  background-color: #e0f2fe;
  color: #0369a1;
  font-size: 0.75rem;
  padding: 3px 8px;
  border-radius: 20px;
  font-weight: 600;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--touch-target);
  padding: 0 14px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.92rem;
  transition: background 0.15s ease, color 0.15s ease;
}

.nav-link:hover {
  background-color: #f8fafc;
  color: var(--primary-color);
}

.nav-link.active {
  background-color: var(--primary-color);
  color: #ffffff;
}

/* ==========================================================================
   LAYOUT STRUCTURE (MOBILE-FIRST)
   ========================================================================== */

.page-wrapper {
  max-width: 1400px;
  margin: 0 auto;
  padding: 16px;
}

/* Main Split View: Single-column on mobile, Side-by-side on desktop */
.billing-layout {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Form Container Card */
.form-card {
  background-color: var(--card-bg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  padding: 18px;
}

.section-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid #f1f5f9;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.section-badge {
  font-size: 0.75rem;
  font-weight: 500;
  background: #f1f5f9;
  color: var(--text-muted);
  padding: 2px 8px;
  border-radius: 4px;
}

/* Form Grid */
.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.form-group.span-full {
  grid-column: 1 / -1;
}

label {
  font-size: 0.85rem;
  font-weight: 600;
  color: #334155;
}

.required-star {
  color: var(--danger-color);
}

/* Touch-friendly Form Inputs */
input[type="text"],
input[type="number"],
input[type="date"],
input[type="time"],
input[type="tel"],
input[type="search"],
select,
textarea {
  width: 100%;
  min-height: var(--touch-target);
  padding: 10px 14px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text-main);
  background-color: #ffffff;
  border: 1.5px solid #cbd5e1;
  border-radius: var(--radius-sm);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

input:disabled,
input[readonly] {
  background-color: #f8fafc;
  color: #64748b;
  cursor: not-allowed;
}

/* ==========================================================================
   ITEMS ENTRY: RESPONSIVE CARDS (MOBILE) / TABLE (DESKTOP)
   ========================================================================== */

.items-section {
  margin-bottom: 20px;
}

/* Desktop Items Table (Hidden by default on small mobile) */
.items-table-wrapper {
  display: none;
  overflow-x: auto;
  margin-bottom: 12px;
}

.items-table {
  width: 100%;
  border-collapse: collapse;
}

.items-table th {
  background-color: #f8fafc;
  text-align: left;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #475569;
  padding: 10px;
  border-bottom: 2px solid #e2e8f0;
}

.items-table td {
  padding: 8px 10px;
  border-bottom: 1px solid #f1f5f9;
  vertical-align: middle;
}

.items-table input {
  min-height: 40px;
}

/* Mobile Items List (Cards) */
.mobile-items-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 14px;
}

.mobile-item-card {
  background-color: #f8fafc;
  border: 1.5px solid #e2e8f0;
  border-radius: var(--radius-md);
  padding: 14px;
  position: relative;
  transition: border-color 0.15s ease;
}

.mobile-item-card:focus-within {
  border-color: #93c5fd;
  background-color: #ffffff;
}

.mobile-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.item-index-badge {
  font-size: 0.75rem;
  font-weight: 700;
  background: #e2e8f0;
  color: #334155;
  padding: 2px 8px;
  border-radius: 4px;
}

.mobile-item-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 10px;
}

.mobile-item-amount {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed #cbd5e1;
  font-weight: 700;
  font-size: 0.95rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: var(--touch-target);
  padding: 10px 18px;
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
  font-family: inherit;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-accent {
  background-color: var(--accent-color);
  color: #ffffff;
}

.btn-accent:hover {
  background-color: var(--accent-hover);
}

.btn-outline {
  background-color: transparent;
  border: 1.5px solid var(--border-color);
  color: var(--text-main);
}

.btn-outline:hover {
  background-color: #f8fafc;
  border-color: #94a3b8;
}

.btn-danger-outline {
  background-color: transparent;
  border: 1px solid #fca5a5;
  color: var(--danger-color);
  padding: 6px 12px;
  font-size: 0.85rem;
  min-height: 36px;
}

.btn-danger-outline:hover {
  background-color: #fef2f2;
  border-color: var(--danger-color);
}

.btn-block {
  width: 100%;
}

.btn-add-item {
  border: 1.5px dashed var(--accent-color);
  color: var(--accent-color);
  background-color: #eff6ff;
  width: 100%;
}

.btn-add-item:hover {
  background-color: #dbeafe;
}

/* ==========================================================================
   BILL FINANCIAL SUMMARY BOX
   ========================================================================== */

.summary-card {
  background-color: #f8fafc;
  border-radius: var(--radius-sm);
  border: 1px solid #e2e8f0;
  padding: 16px;
  margin-top: 14px;
  margin-bottom: 20px;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 0;
  font-size: 0.95rem;
}

.summary-row.grand-total-row {
  border-top: 2px solid #cbd5e1;
  margin-top: 8px;
  padding-top: 10px;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--primary-color);
}

.summary-input-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.summary-input-group input {
  max-width: 110px;
  min-height: 36px;
  padding: 4px 8px;
  text-align: right;
}

.action-buttons-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ==========================================================================
   THERMAL RECEIPT PREVIEW (80mm STYLING)
   ========================================================================== */

.preview-container-card {
  background-color: var(--receipt-bg);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  min-height: 480px;
  position: relative;
  box-shadow: var(--shadow-md);
}

.preview-top-toolbar {
  width: 100%;
  max-width: 320px;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #e2e8f0;
  font-size: 0.85rem;
}

/* Exact reference 80mm receipt container */
.receipt {
  background-color: #ffffff;
  width: 100%;
  max-width: 320px; /* Approximately 80mm at 96 DPI */
  padding: 20px 16px;
  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.35);
  font-family: var(--font-family-mono);
  font-size: 13px;
  line-height: 1.4;
  color: #000000;
  margin: 0 auto;
  border-radius: 2px;
}

.receipt .header {
  text-align: center;
  margin-bottom: 8px;
}

.receipt .header h1 {
  font-size: 20px;
  font-weight: bold;
  margin: 0 0 4px 0;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.receipt .header p {
  margin: 0;
  font-size: 12px;
  line-height: 1.35;
}

.receipt .divider {
  border-top: 1px dashed #000000;
  margin: 8px 0;
  width: 100%;
}

.receipt .info-grid {
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 12px;
}

.receipt .info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.receipt table {
  width: 100%;
  border-collapse: collapse;
  margin: 4px 0;
}

.receipt th {
  text-align: left;
  border-bottom: 1px dashed #000000;
  padding: 6px 0;
  font-size: 12px;
  font-weight: bold;
}

.receipt td {
  padding: 6px 0;
  vertical-align: top;
  font-size: 12.5px;
}

.receipt .col-item {
  width: 55%;
  text-align: left;
  word-break: break-word;
}

.receipt .col-qty {
  width: 15%;
  text-align: center;
}

.receipt .col-price {
  width: 30%;
  text-align: right;
}

.receipt .text-center {
  text-align: center;
}

.receipt .text-right {
  text-align: right;
}

.receipt .total-section {
  margin-top: 4px;
}

.receipt .total-row {
  display: flex;
  justify-content: space-between;
  padding: 2px 0;
  font-size: 12px;
}

.receipt .grand-total {
  border-top: 1px dashed #000000;
  border-bottom: 1px dashed #000000;
  padding: 8px 0;
  margin: 6px 0;
  font-size: 15px;
  font-weight: bold;
}

.receipt .terms {
  margin-top: 12px;
  margin-bottom: 16px;
  font-size: 11px;
  text-align: center;
  letter-spacing: 0.5px;
}

/* In-Receipt Print Button matching user image */
.receipt .no-print {
  margin-top: 14px;
}

.receipt .print-btn {
  width: 100%;
  min-height: var(--touch-target);
  padding: 12px;
  background: #000000;
  color: #ffffff;
  border: none;
  cursor: pointer;
  font-family: var(--font-family-mono);
  font-size: 13px;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: opacity 0.15s ease;
}

.receipt .print-btn:hover {
  opacity: 0.85;
}

/* External Receipt Controls Toolbar (outside receipt paper) */
.preview-controls-bar {
  width: 100%;
  max-width: 320px;
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ==========================================================================
   BILL HISTORY STYLING (RESPONSIVE TABLE & CARDS)
   ========================================================================== */

.filter-bar {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-bottom: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.history-stats-bar {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 18px;
}

.stat-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 12px;
  text-align: center;
}

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 600;
}

.stat-value {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--primary-color);
  margin-top: 4px;
}

/* Desktop History Table */
.history-table-container {
  display: none;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.history-table th {
  background: #f8fafc;
  padding: 12px 14px;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #475569;
  border-bottom: 2px solid #e2e8f0;
}

.history-table td {
  padding: 12px 14px;
  border-bottom: 1px solid #f1f5f9;
  font-size: 0.92rem;
  vertical-align: middle;
}

/* Mobile History Cards */
.history-cards-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.history-bill-card {
  background: #ffffff;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.history-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.history-bill-no {
  font-family: var(--font-family-mono);
  font-weight: 700;
  color: var(--primary-color);
  font-size: 1.05rem;
}

.history-bill-amount {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--primary-color);
}

.history-card-details {
  font-size: 0.88rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.history-card-actions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-top: 6px;
  padding-top: 10px;
  border-top: 1px solid #f1f5f9;
}

@media (min-width: 480px) {
  .history-card-actions {
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
  }
}

.history-card-actions .btn {
  min-height: 38px;
  padding: 6px 4px;
  font-size: 0.82rem;
}

/* ==========================================================================
   TOAST NOTIFICATIONS
   ========================================================================== */

#toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 90vw;
  width: 360px;
  pointer-events: none;
}

.toast {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: slideIn 0.25s ease forwards;
}

.toast.toast-success { background-color: var(--success-color); }
.toast.toast-error { background-color: var(--danger-color); }
.toast.toast-info { background-color: var(--accent-color); }

@keyframes slideIn {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* ==========================================================================
   RESPONSIVE BREAKPOINTS (PROGRESSIVE ENHANCEMENT)
   ========================================================================== */

/* Tablet (min-width: 601px) */
@media (min-width: 601px) {
  .form-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .filter-bar {
    flex-direction: row;
  }

  .action-buttons-group {
    flex-direction: row;
  }

  .action-buttons-group .btn {
    flex: 1;
  }

  .history-stats-bar {
    grid-template-columns: repeat(4, 1fr);
  }

  .preview-controls-bar {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
}

/* Desktop & Laptop (min-width: 1025px) */
@media (min-width: 1025px) {
  .page-wrapper {
    padding: 24px;
  }

  /* Two-Column Split Layout */
  .billing-layout {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
    gap: 28px;
  }

  .preview-container-card {
    position: sticky;
    top: 80px;
  }

  /* Desktop Items Table Visible */
  .items-table-wrapper {
    display: block;
  }

  /* Hide Mobile Items Cards on Desktop */
  .mobile-items-list {
    display: none;
  }

  /* Desktop History Table Visible */
  .history-table-container {
    display: block;
  }

  /* Hide Mobile History Cards on Desktop */
  .history-cards-container {
    display: none;
  }
}

/* ==========================================================================
   PRINT MEDIA QUERY (@media print)
   Only the 80mm receipt itself must print!
   ========================================================================== */

@media print {
  body {
    background: none !important;
    padding: 0 !important;
    margin: 0 !important;
    display: block !important;
    color: #000000 !important;
  }

  .receipt {
    box-shadow: none !important;
    width: 80mm !important;
    max-width: 80mm !important;
    padding: 2mm !important;
    margin: 0 auto !important;
    border: none !important;
  }

  /* Hide all non-receipt elements */
  .app-header,
  .form-card,
  .action-buttons-group,
  .preview-controls-bar,
  .preview-top-toolbar,
  .preview-container-card,
  .no-print,
  .print-btn,
  #toast-container,
  .filter-bar,
  .history-stats-bar,
  .history-table-container,
  .history-cards-container,
  nav {
    display: none !important;
  }

  .billing-layout {
    display: block !important;
  }

  .preview-container-card {
    background: none !important;
    box-shadow: none !important;
    padding: 0 !important;
    display: block !important;
    position: static !important;
  }
}